Improve direnv and poetry interop

 - Adds global `.direnvrc` which defines `layout poetry` that
 initialized poetry environment in a directory with `pyproject.toml`
 - Adds utility script `poetry-here` that creates local `.envrc` and
   sets up direnv
 - Makes appropriate symlinks of these files into `$HOME`

.direnvrc

@@ -0,0 +1,25 @@
+# Define `layout poetry` for local `.envrc`
+#  - https://github.com/direnv/direnv/wiki/Python#poetry
+#  - https://medium.com/analytics-vidhya/best-practice-for-using-poetry-608ab6feaaf
+layout_poetry() {
+
+  if [[ ! -f pyproject.toml ]]; then
+    log_status 'No pyproject.toml found. Will initialize poetry in no-interactive mode'
+
+    # Initialize poetry in no-interactive mode
+    poetry init -n -q
+  fi
+
+  # Create venv if it doesn't exist
+  poetry run true
+
+  # Setup VIRTUAL_ENV and add it to PATH
+  export VIRTUAL_ENV=$(poetry env info --path)
+  export POETRY_ACTIVE=1
+  PATH_add "$VIRTUAL_ENV/bin"
+
+  # Make symlink to `.venv` for easy IDE environment setup
+  if [ ! -L .venv ]; then
+    ln -ns $VIRTUAL_ENV .venv
+  fi
+}

.local/bin/poetry-here

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Allows to run `poetry-here` anywhere one wants to have poetry setup.
+#  - Works even if new project with poetry has not yet been set up
+#  - https://medium.com/analytics-vidhya/best-practice-for-using-poetry-608ab6feaaf
+
+echo "layout poetry" > .envrc
+
+direnv allow .
+direnv exec . true

Makefile

@@ -189,6 +189,7 @@ links: $(ALACRITTY_CONFIG_DIR) $(BYOBU_CONFIG_DIR) ~/.config/nvim/vim-plug ~/.co
 		$(CFG_DIR)/.xsession \
 		$(CFG_DIR)/.gitconfig \
 		$(CFG_DIR)/.pam_environment \
+		$(CFG_DIR)/.direnvrc \
 		$(CFG_DIR)/.zsh* \
 		$(CFG_DIR)/.p10k.zsh
 	@{ \
@@ -200,6 +201,7 @@ links: $(ALACRITTY_CONFIG_DIR) $(BYOBU_CONFIG_DIR) ~/.config/nvim/vim-plug ~/.co
 		$(CFG_DIR)/.local/bin/alacritty_toggle.sh \
 		$(CFG_DIR)/.local/bin/increase_swap.sh \
 		$(CFG_DIR)/.local/bin/init_ubuntu.sh \
+		$(CFG_DIR)/.local/bin/poetry-here \
 		$(CFG_DIR)/.local/bin/upgrade_kernel.sh
 	@[ "$$(grep 'user_readenv=1' /etc/pam.d/login)" ] || \
 		echo "Finish pam env setup by manually updating '/etc/pam.d/login' - see https://askubuntu.com/a/636544"